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Polyester for high temperature resistant powder coating and preparation method thereof

A powder coating, high temperature resistant technology, applied in the direction of powder coating, fireproof coating, coating, etc., can solve the problem of unsatisfactory adhesion and gloss, and achieve the cost of equipment without pollution, easy to operate, and simple preparation method Effect

Active Publication Date: 2018-05-29
HUANGSHAN ZHENGJIE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still various shortcomings in the preparation and application of existing silicon-modified polyester resins, which cannot meet the above practical application requirements; at the same time, its adhesion and gloss are unsatisfactory

Method used

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  • Polyester for high temperature resistant powder coating and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare the high temperature resistant powder coating polyester of the present invention according to the following method, the method comprises the following steps: 1) add terephthalic acid, isophthalic acid, trimellitic anhydride, neopentyl glycol and tetraisopropyl titanate in a reaction vessel , and its parts by weight are respectively 15 parts, 7 parts, 3 parts, 11 parts and 0.1 part, while adding xylene as a solvent;

[0033] 2) Heat to 170°C to melt all the materials, then add 0.3 parts of triphenyl phosphite, slowly raise the temperature to 220°C, and the heating rate is 10-20°C / h;

[0034] 3) When the temperature is higher than 220°C, control the temperature of the reaction mixture between 220-240°C, and the reaction time is 3-12h;

[0035] 4) Cool down to 180°C, add 1 part of trimethylolpropane, slowly heat up to 220°C to continue the reaction, so that the acid value is less than 10mgKOH / g; then add xylene to form a polyester intermediate solution with a solid...

Embodiment 2

[0041] Prepare the high temperature resistant powder coating polyester of the present invention according to the following method, the method comprises the following steps: 1) add terephthalic acid, isophthalic acid, trimellitic anhydride, neopentyl glycol and tetraisopropyl titanate in a reaction vessel , and its parts by weight are respectively 16 parts, 7.5 parts, 3.5 parts, 12 parts and 0.1 parts, while adding xylene as a solvent;

[0042] 2) Heat to 170°C to melt all the materials, then add 0.3 parts of triphenyl phosphite, slowly raise the temperature to 220°C, and the heating rate is 10-20°C / h;

[0043] 3) When the temperature is higher than 220°C, control the temperature of the reaction mixture between 220-240°C, and the reaction time is 3-12h;

[0044] 4) Cool down to 180°C, add 1.5 parts of trimethylolpropane, slowly raise the temperature to 220°C to continue the reaction, so that the acid value is less than 10mgKOH / g; then add xylene to form a polyester intermediate s...

Embodiment 3

[0050] Prepare the high temperature resistant powder coating polyester of the present invention according to the following method, the method comprises the following steps: 1) add terephthalic acid, isophthalic acid, trimellitic anhydride, neopentyl glycol and tetraisopropyl titanate in a reaction vessel , its parts by weight are respectively 17 parts, 8 parts, 4 parts, 14 parts and 0.1 part, adding xylene simultaneously as solvent;

[0051] 2) Heat to 170°C to melt all the materials, then add 0.3 parts of triphenyl phosphite, slowly raise the temperature to 220°C, and the heating rate is 10-20°C / h;

[0052] 3) When the temperature is higher than 220°C, control the temperature of the reaction mixture between 220-240°C, and the reaction time is 3-12h;

[0053] 4) Cool down to 180°C, add 2 parts of trimethylolpropane, slowly raise the temperature to 220°C to continue the reaction, so that the acid value is less than 10mgKOH / g; then add xylene to form a polyester intermediate sol...

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Abstract

The invention discloses high-temperature-resistant polyester for a powder coating and a preparation method of the high-temperature-resistant polyester. The preparation method comprises the following steps that 1, a polyester intermediate solution is prepared; 2, a silicon intermediate solution is prepared; 3, the polyester intermediate solution and the silicon intermediate solution react to obtain high-temperature-resistant polyester for the powder coating. High-temperature-resistant polyester for the powder coating can meet the high-temperature-resistant requirement of 300 DEG C or above, and the adhesive force and glossiness obtained after 1 h and 3 h of baking at the temperature are not obviously changed, and are superior to those in the prior art under the same condition.

Description

technical field [0001] The invention belongs to the field of high molecular polymers and relates to a polyester resin and a preparation method thereof, in particular to a polyester for high-temperature-resistant powder coating and a preparation method thereof. Background technique [0002] Powder coating is one of the most promising coating varieties in the world today, and belongs to a rapidly developing coating branch. Compared with traditional solvent-based coatings, it has the characteristics of saving energy and resources, reducing environmental pollution, simple process, durable coating, recyclable powder, and wide application fields. Conventional powder coatings mainly include film-forming substances, curing agents, leveling agents and pigments. Among them, the most common film-forming substance is polyester resin. [0003] The temperature resistance of existing powder coatings is usually only 200°C, and it is difficult to meet the temperature resistance requirement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/10C09D5/03C08G77/445C08G63/20C08G77/20
CPCC08G63/20C08G77/20C08G77/445C09D5/03C09D5/18C09D183/10
Inventor 江建明许国徽方敏辉王永垒
Owner HUANGSHAN ZHENGJIE NEW MATERIALS